Burglar-alarm for safes.



T. PRUSHBY.

BURGLAR ALARM FOR SAFES. APPLICATION FILED AUG.16. 1911. RENEWED JUNE 6, 1914.

1,124, 1 69a Patented Jan. 5, 1915.

3 SHEETS-SHEET 1.

i700 mm Z ra/Jfiey.

F. PRUSHEYJ BURGLAR ALARM FOR SAFBS.

Patented Jan. 5, 1915.

APPLICATION FILED AUG.16. 1911* RENEWED JUNE 6, 1914.

3 SHEETS-SHEET 2.

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wue/wtoz T. PRUSHEY.

BURGLAR ALARM FOR SAFBS. APPLICATION FILED AUG.16. 1911. RENEWED JUNE 6, 1914.

1,124, 1 69. Patented 1511.5, 1915 3 SHEETSSHEBT 3.

THOMAS PRUSHEY, OF TACOMA, WASHINGTON.

BURGLAR-ALARM FOR SAFES.

Specification of Letters Patent.

Patented Jan. 5, 1915.

Application filed August 16, 1911, Serial No. 644,292. Renewed June 6, 1914. Serial No. 843,567.

To all whom it may concern:

Be it known that I, THOMAS PRUSHEY, a citizen of. the United States, residing at Tacoma, in the county of Pierce and State of Washington, have invented new and useful Improvements in Burglar-Alarms for Safes, of which the following is a specification.

The invention relates to burglar alarms, and more particularly to the class of alarms for safes, vaults, or the like.

The primary object of the-inventi on is the provision of an alarm'in which a signal will be sounded, should an attempt be made to rob, blow-up, or otherwise tamper with the safe, thereby giving notice for enabling the defeat of such an attempt by an unscrupulous person or persons.

Another object of the invention is the provision of an alarm in which a safe, vault, or similar depository will be protected, should any attempt be made to burglarize the safe, a signal will be given, indicating the same. i

A further object of the invention is the provision of a burglar alarm for safes or other depositories which is simple in construction, positive, reliable and eflicient in operation, and inexpensive in installation.

Other objects of the invention will be in part obvious, and in part hereinafter pointed out. I

The invention accordingly consists in the features of construction, combination of elements, and arrangement of parts, as will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the following claim.

In the drawings: Figure 1 is a front elevation of a burglar alarm as applied to a. safe, portions thereof being broken away. Fig. 2 is a top plan view, the top of the housing being broken away. Fig. 3 is a vertical sectional view through the housing. Fig. 4 is a sectional view on the line 4-4 of Fig. 1. Fig. 5 is a sectional view on the line 55 of Fig. 1. Fig. 6 is an enlarged detail View of the switch and its controlling mechanism, the latter being partly in section. Fig. 7 is an edge elevation thereof.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

Referring'to the drawings by numerals, 1O designates a safe. which is of the ordinary well-known construction. Thesafe 10 1s inclosed by a metallic housing or casing 11 having at its front the usual hinged door 12, so that access may be had to the interior thereof, when it is desired to open the safe. The housing 11 is "provided, interiorly thereof, with air chambers 13 formed by an inner lining 14: covering the bottom, sides, rear and top' walls of the casing or housing, and likewise the door 12' is provided with an air chamber 15 formed by an inner lining 16 thereon.

Formed exteriorly of the housing or casing 11 at the bottom thereof are outturned ears 17, the same being bolted or otherwise secured to the floor 18 of a building, as will be obvious. Projecting from the linings 1 k and 16 on the walls of the housing and door, respectively, are hose connecting nipples 20, to which is connected flexible hose 21, so that the chambers 13 and 15 will be in communication with each other,- the same being adapted to be filled with compressed air, for a purpose presently described.

At an elevated point above the housing or casing 11, and mounted upon one side wall of the building, is an electric switch, and its controlling mechanism, comprising a base plate 21, the same being enveloped or concealed by a suitable boxing 22 having at its front a hinged door 28, whereby a person may have access to the interior thereof, the plate 21 being designed to support a swingingly mounted switch arm 24, the same being connected at one end by means of a pivot 25 to the plate. Mounted in the plate 21', in the path of movement of the free end of the switch arm 24, is a contact 26, to which is connected one end of an electric current wire 27, while connected to one pole of the battery 28, is a wire 29 and to the other pole of which leads a second electric current wire 29', the same being connected to. the pivot 25 of the switch arm 24. The wires 27 and 29 at their other ends are connected with a signal device presently described. Thus, it Will be seen that when the free end of the switch is moved onto the contact 26, a circuit will be closed between the battery 28 and .said switch. The signal in the circuit comprises an electric bell 30, the latter being adapted to be sounded on the closing of said circuit, and is adapted to be mounted interiorly'or exteriorly of the building at the desired point thereof. The electric circuit arm 24, and when this cylinder is filled with compressed air, the switch arm 24 is elevated or. normally disengaged from the contact 26, thereby sustaining the electric circuit open, but upon the escape of the compressed air, the circuit will be instantly closed, thereby sounding the bell.-

and giving the alarm. Connected with the piston cylinder 31 is an air pipe 34, the same being also connected with the chamber 13 on the rear wall of the casing or housing 11, so that communication ishad between the said piston cylinder and the air chambers 13 interiorly of the housing or casing, and assuming that these chambers in the cylinder have been filled with compressed air, and should an attempt be made to drill a hole in the housing or casing 11, the said compressed air will escape, thereby permitting the switch arm 24 to drop upon the contact 26, thus sounding the bell 30. and giving an alarm, indicating an attempt is being made to rob the safe 10 Within the housing or casing.

Rising from the lining 14, forming the 6 air chamber on the bottom of the housing or casing 11, is an air inlet barrel 35, to.

which is adapted to be connected any suitable air compressor (not shown), for supplying compressed air to the chamber and the piston cylinder. Mounted within the barrel-35. is a rotatable valve 36 which is provided with a crank handle 37 which permits the valve to be opened or closed, as will be obvious, and when this valve is opened the compressed air may readily escape interiorly of the casing. Connected with the lining 17 upon the door 12 of the casing or housing 11 is a pivoted latch 38 which latter is adapted to engage with the crank handle 37 on the closing of the door, it being understood that prior to the closing of the door, the valve 36 is in closed position, so that should an attempt be made to open the door 12, the crank handle 37 will be turned for the opening of the valve 36, thereby permitting the escape of compressed air from the chambers, and in this manner reducing the pressure in the piston cylinder 31, so that the switch will automatically close the electric circuit for the sounding of the bell.

Mounted in the piston cylinder, near the lower end thereof is an offset valve casing 39 having an outlet 40 communicating with the atmosphere, and arranged within this valve casing is a turning valve 41 provided with a crank arm 42, the same normally closing the opening 40, and upon thearm 24 into engagement with the contact 26,

whereupon the circuit will become closed and the bell 30 sounded for giving warning of a malicious tampering with the alarm.

From the foregoing, taken in connection with the accompanying drawings, it is thought that the construction and operation of the invention will be readily understood, without requiring a more extended explanation.

What is claimed is:

The combination with a normally open electric circuit' of a signaling device connected with the circuit, a switch arranged within the circuit and adapted to close the same, a safe casing adapted to receivev a safe and having a swinging door, the said casing and door being provided with compressed air compartments having communication with each other, a compressed air cylinder rising from the bottom of the said casing and communicating therewith and having a discharge port in its top, a turning valve normally closing said discharge port and mounted within the cylinder, a crank handle formed on the said valve, compressed airvcontr'ol means communicating with one of the compartments in the casing and connected with the switch for moving same to position for closing the circuit on the decreasing of pressure of the compressed air within said compartment, a box inclosing said switch and said last named means and having a door, the said last named means being provided with a discharge port, a valve normally closing said port-and having a crank handle, and trip catch devices carried by the said doors and engageable with the cranks to automatically turn the valves on the opening of said doors for the opening of the ports to permit the escape of compressed air from'the last named means and the said compartments in the casing.

. In testimony whereof I atfix my signature in presence of two witnesses.

THOMAS PRUSHEY. 

